Panzer SK VI Mammut
Developed as a secret during the middle stages of WW2 by the Austrians, the Panzer SK VI Mammut was an absolute beast compared to other tank models. Armed with a 120mm gun and armoured on all sides by sloped 250mm armour (320mm effectiveness), the Mammut was deemed all but impossible to penetrate, let alone take out. Due to its sheer weight and size however, the Panzer SK VI Mammut was only ever placed in defensive situations. This severely limited its usage and so was considered obsolete by the end of the war.
Based on the Maus and BT-SV tanks